Subject Categories: 450202* Weaponry -- (-1989) 10/5/655 01517741 Author(s): -- Explosions & Explosives -- Nuclear -~ (Item 355 from file: 103) EDB-85-024503 Frederick, J.B. . Title: Operation Crossroads. Atomic Bomb Tests. Volume 6, Part 2,° Appendix Ix. Final report of Army ground group Corporate Source: Joint Task Force One, Washington, DC (USA) _ Publication Date: 30 Sep 1946 p 250 ‘ Report Number(s): AD-367504/8; XRD-155 Note: See also Volume 6, Part 1, Appendix 9, AD-367 505 Document Type: Report Language: English Journal Announcement: ERA8411 Availability: NTIS, PC All/MF AOl. Subfile: ERA (Energy Research Abstracts). Country of Origin: United States Country of Publication: United States Abstract: Potential fires within approximately 800 yards of the detonation center were extinguished by the closely following air blast, (except where high porosity of certain material enabled the heat radiation to penetrate) where as many distant fires would have been extinguished had the air blast been greater. Inflammability of fiber materials was greatly increased by presence of surface fuzz and high porosity. Objects having a cylindrical surface enabled the blast radiation to be directly normal to a portion of the surface and thus, if porous, penetrate deeper than would have otherwise been the case. The velocity of the air blast, and therefore its fire extinguishing power was greatly reduced by deck houses and other obstructions. Close packaging increased the fire hazard by forming crevasses where heat radiation could penetrate. Underground metal objects of a high surface/mass ratio that were directly exposed to the blast were the recipients of energy that manifested itself in the form of heat.; Major Descriptors: *CROSSROADS PROJECT ~- BLAST EFFECTS Descriptors: NUCLEAR EXPLOSIONS; VULNERABILITY Broader Terms: EXPLOSIONS; NUCLEAR EXPLOSIONS Subject Categories: 450202* -- Explosions & Explosives -- Nuclear -Weaponry ~~ (71989) 10/5/656 01517740 (Item 356 from file: BEDB-85-024502 103) Author(s): Frederick, J.D. Title: Operation Crossroads. Atomic Bomb Tests. Volume 7, Final report of Army ground group Corporate Source: Publication Date: Report Number(s): Joint Task Force One, 27 Aug 1946 NTIS, Washington, DC AD-367503/0; XRD-156 Note: See also Volume 6, Part 2, Document Type: Report Language: English Journal Announcement: ERA8411 Availability: p 260 Appendix 9%, AD-367 504 PC Al2/MF AOl. Appendix X. (USA) % Subfile: ERA (Energy Research Abstracts). Country of Origin: United States Country of Publication: United States Abstract: Blast was the most destructive force acting against equipment exposed. The heat wave was of such short duration or low temperature that little damage occurred to Army Air Forces test items. Dispersion is an effective passive defense against atomic bomb attack. All aircraft instruments were unharmed by radioactivity. Methyl Bromide will retain radioactivity to a dangerous degree for an extended period. High pressure steel flasks, such as carbon dioxide bottles, will withstand extreme exposure to atomic detonation. No Army Air Forces exposed items were materially injured by radioactivity. ; Major Descriptors: *CROSSROADS PROJECT -- BLAST EFFECTS